public function newDummyClient()
 {
     $res = new Client();
     $tmp = rand(0, sizeof(Persistence::$clientNames) - 1);
     $dummyName = Persistence::$clientNames[$tmp];
     $dummyName = $dummyName . rand(10, 100);
     $res->setName($dummyName);
     $tmp = "VAT-" . rand(1000, 30000);
     $res->setVatNumber($tmp);
     return $res;
 }